Attachment for drill presses



Jam.V 8 1924.` 1,480,494 F. E. BESSLER ATTACHMENT FOR DRTLL PRESSES Filed May 2'. 1921 l 5 Sheets-Smet l Jan. 8 1924. 1,480,494

F. E. BESSLER ATTACHMENT FOR DRILL PRESSES Filed May 2, 1921 5 Sheets-Sheet 2 @www 1480 494 um 8 1924 F. E. BEssLER ATTACHMENT FOR 'DRILL PRESSES Filed May 2, 1921 1,480,494 F. ESBI-:ssLEr-z ATTACHMENT FOR DRILL PRESSES Filed may?. 1921 susheeis-sheet 4 1 5 e w w dan. s 1924.

F. E. BEssLER.,

ATTACHMENT FOR DRILL PRESSES Filed May 2. 1921 9H #anni ,\N\\ mw ww, mm,

invade? jZlJsZe f and to enhance the Patented Jene, 19.24.

FRANK E; BESSLER, OF AKRONfOHIO..

Application ledrlflay 2,

- To, all. whom #may concern.'

Beit known that I, FRANK E..l 3nssLin2,V

a citizen of the United States, residino4 at Akron, ,inthe county of Summit and 3atev of Chio, have invented v.a new rand useful Attachment for Drill Presses, of whichthe following is a'specication.`

AThis invention .aims to provide novelA means whereby. a -drill press may be con-` verted into. a. vtapping machine, -fthe'shaft which carries the--tapp1ng tool being advanced and retracted.automatically, it .being necessary, merely,-fforltl ie operator to feed the .work under the tapping tool.

. The invention aims to improve generally, tility of, devices of that sort hereinafter describe l .dov not bind myselfto the specific form setffforth, since, within the scope kof what is4 claimed, amechanic may work changes without Vdeparting.from the spirit ofthe invention.

.Inr the., drawings .Figure l1 jshows in perspective, Aan attachment constructed in accordance with thev invention andn applied to a` drilly press; Figure 2 vis a side lelevation of thedevice-forming thesubject matter of this application; Figure 3 isv alongitudinal section through themechanisml which is mounted -onv lthe mainshaft; Figure; 4e is la sectional view .illustrating the connection betweenv the main and auxiliaryshaftml igure 5 is` an elevation of the Emechanism shown in Figure-4;"Fig11re 6 isa cross sectionv onthe lline 6,-6 of Figure 3; Figure' 7 is a sectionon theline 7`7 of Figure 3;. Figure S is a section on the line 8-1-3'01 Figure 3; Figure 9 is rfragmental side elevationshowing one of the camftracks' and attendant par-ts; Figure 1() is a ,bottom plan of the cam track. z Y v,

The numeralk lmdenotes theframe of a drill press, the l,frame carrying bearings 2, 3,; and f1. l'The main shaft 5 of ythe-drill press ,is -journaled in they bearings 2 and 3,

' the, auxiliary er drill-carryingshaft 59'be ing journaledin the bearing 4.

.Assuming that it is desired to transform adrill press Vinto a -tapping-Ymachine, the cone 4pulley 6, which usually is ifast to the shaft 5, is journaled lfor rotation thereon and is. heldgagainst longitudinal movement on the )shaft by a screw.I 11 in .the pulley, and a groove l2finyth'e`shaft. V'The hub. of the pulley 6 is supplied with anY oil chamber "ed throughS any suitablelmerfins S. A

' cooperates .1921.. semi No. 66h64.

clutch member 9 is attached anchor 10 tothe inner end portion ofthe/'pulley' f6.

011 'the main-'Shaft 5. and is held against longitudinal movement. thereon by a vscrew 15 in the pulley, ,andai A pulley 14 is journaled groove 16 .in 'theshafh l A clutch member l is securedY at 18 tothe pulley 14.

"AV bracket 19 is attached at f20 to the framel and supportsa Uf'shaped frame V21,

attached to the bracket '19, as indicatedfat l tesa slide carry# .22. The numeral '23 den, v y ing an oil cup 24' for the lubrication 'of parts which are locatec'lv beneath the slide.

membersv '27'.and. 31, lmounted onthe ',shaft, arepjournaled in the yokes. "ThekgslideQ-S thusis supported from .the shaft 5, and is movable.; longitudinally of vthe shaft, the

prevented from tilting trans@A slide beingV versely of the shaft, by engagement with the end portions of the frame 2l. lThe clutch member 27 has a` hu'b28 vsplined to thel shaft 5 for slidinggmovementthereon,

the splineconstructionibeing'indicated at 29. 'There is an yopening-30 in the clutch member 17, for the receptionof the hub 28 ofthe clutch member 27 the I'clutch member 27 being :adapted to cooperate k.with the clutch member 17. Y clutch ,memberv 31 is splined. `at 33 to vthe shaft 5, to the end that thefclutch member 31 may be slid'into and out.. of engagement with the clutch member of the hub 32 off the clutch. member L31."

. YOkf-S' i 25.are.secured1at 26.to theV slide. Qlutchj `e" Vbut e2, of Y the 9. VVThe clutch mem-VV ber 9..hasan openingfSafergthe` reception se Y A shift bar 35 isv mounted fer' rightline -reciprocation inthe ends of "the frame 21.

LeversN 36 and'37 are fulcruined intermediate Y Y The' their ends, asat 38, yon the' frame' 21. lower ends of the levers 36 and 37am pivoted tothe ends of the shift barg35.v 4 The lever'3 with ,the clutch movement longitudinally of the shift' bar.

n member 371the l lever 36 cooperating' with thepc'lu'tch member A screw 11 is connected at 4-2 to theshaft 5,;to rotate therewith, the screw being located between .the ends lof the frame 21K, and being heldthereby against movement longitudinallyv ofthe shaft 5-.1'Th'e' screw Vi111 is threaded into a nut 43' havinga reduced depending shank et which is lnotchedpat to receive thefshift barA 35-,the shank 4211 of the n ut org.. traveller 43 bei-ng: located between the-stops. 39'. Rec'esses f1-6 are formed inthe sides of the nut 43, actuators 47 being slidable in the recesses, the actuators having Oppositely slanting surfaces as shown in Figure 9. The actuators 47 have shanks 4:5 slidable in the nut 43 and connected, below the body of the nut, to a cross head 49 which is slidable on theshank44 of the nut. Compression springs 50 arelocated in the recesses 46 Yand tend to thrust the actuators upwardly. Cam tracks 51 are provided, the same comprising, each, members 52 and 52', tongued and grooved together as shown at 53, to the end that the eective length of the cam track may be increased. The meinbers 52 and 52n of the cam tracks are adjustably secured at 54 to the side portions of the slide 23. The actuators 47 cooperate with the cam tracks 51 in a way which will be pointed out hereinafter.

A beveled pinion on the main shaft 5 meshes into a beveled pinion 56 on the auxiliary Vor drill-carrying shaft 59, the beveled pinions being located beneath a housing 57, supported as indicated at The hub of the beveled pinion 56 is journaled in the bearing 4 and is splined at 60 to the shaft 59, the construction being such that, although the pinion56 will drive the shaft 59, the shaft 59 can move endwise in the pinion.- A screw 62 is secured at 61 to the shaft 59 and is threaded into a support 63 having reduced ends 64 received in guide slots V65 formed in brackets 66 and 67, the bracket 66 being connected. at 75 to the bearing 3, and the bracket 67 being connected at 76 to the bearing 4. Springs 68 are located in the brackets 66 and 67, and, cooperating with the parts 64 of the Vsupport 63, hold the support securely but yieldably in the position `shown in Figure 4. Screws 69 are threaded into the brackets 66 and 67 and afford means for adjusting the vcompressive effort of the springs 68. There is a depression 70 in the upper surface of the support 63. An oil cup 71 is mounted ou a bracket 72 secured at 79 to the support 63. The oil proceeding from the cup 71 is discharged bv the bracket 72 into the` uepression 70 of the support 63. aud in this way, the screw Y62 is lubricated.

Nhen the shaft 5 is rotated in one direction, motion will be transmitted by the beveled pinions 55 and and the spline to the shaft 59. The shaft will be rotated, and will be fed downwardly, because the screw 62 is threaded into the support 63. When the shaft 5 is rotated in an opposite direction, reverse rotation will be transmitted to the shaft 59, the screw 62 effecting `a raising of the shaft 59, From the foregoing it will be obvious that a tap on the end of the shaft 59, will be fed downwardly a predetermined distance and be retracted, the tap being rotated at the same time. In case that a destructive or unusual strain is put Y clutch member 17 is concerned.

on the shaft 59, the springs 68 will yielc. l`urther, the springs 63 enable'the shaft 59 to be raised and lowered by the common controlling Vmechanism 100, provided for that purpose upon a drill press.

lt has been pointed out hereinbefore that the shaft 5 is rotated first in one direction and then in an opposite direction. Lety it be supposed, further, tated continuously in one direction, the pulley 14 being rotated continuously in an 0pposite direction. A. means is provided whereby the pulleys Gand 14 are coupled one at a time, automatically, to the shaft 5, to Vsecure a reversal of the shaft, and the operation of this means will now be set forth.

Suppose that the clutch member 31 is coupled to the clutch member 9, the clutch member 27heing out of engagement with the clutch memberV rotated by a train of elements including the pulley 6, theclutch member 9, the clut'chf member 31, and the spline 33. 41 is rotated, and the nut 43 moves right in Figure 3, the shank 44 of the nut engaging the right stop 39 and moving the shift bar 35 to the right,the lever 37 swinging away from the clutch member 31. The lever 36 moves thelclutch member 27 into engagement with the clutch member 17 and couples the pulley 14 to the shaft 5, the slide 23 moving to the lefty and disengaging the clutch member 31 from 9. Since the pulleys 14 and 6 rotate in opposite directions, the direction of rotation of the shaft 5 will be reversed by the operation above set forth. appreciable interval when the clutch member 31 is out of engagement with the clutch member 9, and when the Vclutch member 27 is out of engagement with the clutch member 17. This observation is necessarily true, because, clearly, the shaft 5 cannot be coupled at one time to the. oppositely rotating pulleys 6 and 14. During the aforesaid interval, some means must be provided for moving the slide 23, and consequently the clutch member 27, to the left, because if, for an instant, neither the pulley 6 nor the pulley 14 drives the shaftb, the screw. 41, the nut 43, the shift bar 35 will be of no effect, so far as moving Lthe clutch member 27 into engagement with the It is at this time that the actuators 47 do their work. Note Figure 9. rlhe actuators 47 are thrust upwardly by the springs 50, and, coacting with the inelines at the right hand end of the cam tracks 51, carry the slide 23 and the clutch 27 to the left 27 cooperates with the pulley 14. a driving means, the direction of rotation of the screw 41 is reversed, and the direction of travel of the nut 43 and the shift bar 35is re- The screw that the pulley 6 is ro- 17. Then, the shaftisr the clutch memberA There 1s a short but Y and the lever until the saidpart. the clutch element 17 on' When the pulley 14 becomes l to the versed, the lever 37 moving the clutch member 8l to the right, and the actuators 47 operating at the left hand ends of the cam tracks 5l (Figure 9) in a way which will be understood clearly in view of what has been stated hereinbefore I claim l. In a device of the class described, aftap shaft; a driven shaft disposed at an angle to the tap shaft; means for connecting the shafts operatively; means for raising and lowering the tap shaft responsive to a change in the direction of rotation of the tap shaft; rotatable members loose on the driven shaft;

a screw on the. driven shaft; a nut traversing the screw; clutch means on the driven shaftfor connecting the rotatable members, one at a time, with the driven shaft; and mechanism. operated by the nut for moving the clutch means in opposite directions toward the respective rotatable memberssaid mechanism comprising a shift bar supported for right line sliding movement;`

stops on the shift bar` for engagement by Y the nut; and movable elements operated by the shift bar and coacting with the clutch means to move the same in opposite directions.

2. In a device of the class described, a tap shaft; a driven shaft disposed at an angle to the tap shaft; means for connecting the shafts operatively; means for raising and lowering the tap shaft responsive to a change in the direction of rotation of the tap shaft; rotatable members/loose on the driven shaft; a screw onthe driven shaft;

a nut traversing the screw; clutch mea-ns -onV the driven shaft for connecting the rotatable members, one at a time, with the driven shaft; and mechanism'operated by the nut for moving the clutch means in opposite directions toward the respective rotatable members-said mechanism comprising a shift bar supported fori-ight line sliding movement; stops on the bar, on `opposite sides of the nut, and engageable thereby; levers cooperating with the clutch means and pivoted to the shift bar; and fulcra supporting the levers, intermediate their ends.

3. In a device of the class described, a tap shaft; a driven-shaft disposed at an angle to the tap shaft; means for connecting the rotatable members one at a time with e the driven shaft; means responsive toY achange in the direction of rotation ofthe driven shaft for movingY the clutch means towardv the respective driven members; a cam track on the clutch means; operated actuator on the means responsive to a changein the direction of rotation of the driven shaft, and coacting with thecani track, tomoveV the clutch means into engageand a springment Withthe respective rotatable members f when the clutch l'means is in-V a neutral position,

of the class described, a

4. In a device driven shaft; the driven shaft; clutches slidable on-the shaft and cooperating, one at a time, with the rotatable members; the clutches; a cam track on the slide; a screw on the'driven shaft; a nut traversing the screw; a spring-operated actuator on the nut and coacting withV the cam track to operate the clutches when the same are in a neutral position; a tap shaft an angle to the driven connecting the shafts; endwise movement to posite directions, the direction of and mechanism actuated by the nut for vmoving the clutches, one at a time, toward the respective rotatable members-said mechanism comprisingy a shift bar mounted for right line sliding shift bar,"in the path of the nut; levers col operating with the clutches and pivoted to thes shift bar; and fulcra whereon the levers are supported intermediate their ends.

In testimony that I claim the foregoing as my own, I have hereto afHXed my signature in the presence of two witnesses.

shaft; means for means for imparting the tap shaft, inop- Witnesses:

RUTH VVEmNER, E. VERGoN SMITH.

a slide connecting disposed at FRANK E, Bassins. i

rotatable members loose onV responsive to a change in rotation of the tap shaft;

movement; stops on the 7 

